Take 1 gallon of lime juice, of spec. grav. 1·085; dissolve in it
3 pounds of tartaric acid, and one pound of oxalic acid; thicken
with
6 pounds of gum senegal, or 5 pounds of British gum.
6., 7. A stronger and weaker discharge is made of the same materials;
and one is made without the tartaric acid.
_Second_; combination of discharges with mordants.